Hi Yuri, Using the same software that W6TSW used, YO, one can easily scale any Yagi from band to band (frequency to frequency) with ease. I have found excellent correlation. I have scaled numerous VH
Jon, I disagree. The plate I use is mounted near the TOP of my Rohn 25 top section, the section with the flat top. I do agree that it would be nice to mount it at the bottom....where it wont fit... w
Brad, Try Metal and Cable Corp., Twinburg, OH (330) 425-8455. They used to advertise in QST and is ham oriented. I believe he stocks 6061-T6 aluminum. 73, Joe, W1JR At 05:41 AM 1/25/2003 -0600, N9EN@
Chuck, Last year a bought and measured the Radio Works Line Isolator in my in line (isolation on the outer shield) balun test setup using an HP Network Analyzer. It measured about 220 Ohm at 1.8 MHz
Michael, Chuck etal, The most popular ham antenna tuners use the so called "T" network because it is the most versatile network (matches the greatest range of impedances). For lowest loss, always sta
Paul and Jim, The Cushcraft MA5V was designed by K1BQT, Rick Littlefield and he calls it an "Off Center Fed Dipole). In the Jan/Feb 2002 issue of QEX, page 54, is a complete technical write up on sam
Bill, I purchased replacement relays direct from Ameritron in Mississippi at a reasonable price. 73, Joe, W1JR At 03:05 PM 9/16/2003, Cqtestk4xs@aol.com wrote: I am looking for a source of replacemen
Tower talkers, Does anyone on this reflector have the EF Johnson specifications/data sheet on their model 229-201 rotary inductor? If so, could you please send me what they claim for power, inductian
Gordon, One of the "rules-of-thumb" used with tubing is to overlap 2-3 times the diameter of the element. Therefore, 5" is great on 1.625" tubing while only about 2-1/2" is needed on the .875" diamet
Pete, Yes, these Rubbermaid boxes are cheap but in a year or so, the UV rays from the sun will start to make the box brittle and eventually fall apart. This is from my experience using one of these b
Jim, While in Australia, I think Grote was studying some other phenomenon at very low frequencies (instead of at HF). He recently became a silent key. A story on his life, I believe, was in a recent
Pat, I made very careful VSWR and F/B ratio tests on my XM-240. Then I attached a 1.0" wide aluminum strap around the center of the reflector and bolted it to the channel to ground same. Then I caref
Terry, I had the same problem with 6 conductor line. I guess 60 Hz pickup. I don't know if capacitance on the line is a problem but I used RG59 coax on the reed relay line and the problem went away.
Hi Charlie, Sounds like the Cushcraft model 40-2CD. There are no traps. They are loading coils and a capacity hat. The data sheet/assembly manual should be on the Cushcraft website. 73, Joe, W1JR ___
Carlos, I am using a modified 30 meter beam with parts from a 40-2CD. Basically, the top hat rods (36" elements after the inductor) are removed. Next, the spacing is reduced to 140". The boom could b
Hi Arnie, I guess there has been a discussion on baluns going on. Let me add a few comments on the subject. First off, there are alternatives or choices on transmission line types used in coax baluns
Hi Ian, Great to hear from you. Was thinking of you and Nadine when we heard about all the flooding in Oxford. That was a great visit with both of you. I'll bet you're glad you're not there now! Than
Greg, The impedance of the Skyhawk is about 50 Ohms resistive. The balun is a ferrite one (similar to W2DU) made by Cal Aviation. 73, Joe, W1JR _______________________________________________ _______
Jim etal, I also measured the effect of ground radials when I loaded my 70 foot tower (with 40 meter beam on top) on 160 meters. I used an HP 9753C network analyzer and a non resonant loop about 6 fe